You need to install following dependecies in order to build the docs in headless mode:

• xvfb (system package)
• pyvirtualdisplay (python package)

You'll also need to install sphinx.

Execute following commands as root user to install the dependencies. For ubuntu users:

    apt-get install xvfb

For RHEL/CentOS/Fedora users:

    yum install xorg-x11-server-Xvfb

Then, install following python packages:

    pip install pyvirtualdisplay
    pip install sphinx

Change your current working directory to sphinx-docs directory under ka-lite root and execute following command:

    make html

If the above command executes successfully, docs should be found under sphinx-docs/_build directory inside ka-lite.